Drill-sharpening attachment for grinding-machines.



A. G. RODGERS.

DRILL $HARPENING ATTACHMENT FOB. GRINDING MACHINES.

APPLICATION FILED SEPT. s, 1912.

- 1,052,968. Patented Feb. 11,1913.

WITNESSES ENTOR UNITE i l s TA'rEs PATENT cur os.

AsnmnAD G. screens, on NIAGARA FALLS, new Yomi, ASSIGNOR To run cannonunngivr COMPANY, or NIAGAR FALLs, new YORK, A CORPORATION or renn- SYLVANIA nnrnn-snanrnnms Ar'rAcHMnNr ron GBINDING-MAdHINES.

Patented Feb. 11, 1913.

Application filed September 6, 1912. Serial No. 719,028.

To all whom it may concern: I

Be it known that I, ASHMEAD G. Roncnns, a resident of Niagara. Falls, Niagara county, New York, have invnted a new and useful Drill-Sharpening Attachment for Grinding- Machines, of which the following is a full,

clear, and exact description, reference beinghad to the accompanying drawings, forming partof this specification, in which- Figure 1 is a side elevation of-a grindin machine showing one form of my improve attachment connected thereto; .Fig. 2 is an 1 1; 3 at its upper end. Secured to thisis secured thereto by means of screws 10, one

of which passes through the slot ;8 the end vieucof thesame; Fig. 3 is'a plan view of the wheel, together with the drill holder and support in one position when used for grinding a drill; Fig. 4 is a longitudinal sectional view through the drill holder and .stop; and Fig. 5 is a transverse section on the line VV of Fig. 4. i My invention has relation to attachments gor rinding machines for holding drills to s s arpened, and more particularly for wist drills; and is designed to provide a cheap and eflicient device of this character which can readily be attached and removed from a hand grinding machine, and which a scope of my invention as defined in the appended claims. p

In the' accompanying drawings, the num lial 2 designates a grinding wheel; which is rbtatably' mounted on a shaft 3, which isdriven by means of gearing connected to a shaft 4, and within agear casingo'. Con nected to one end of a shaft 4 isifn operating crank 6.

Fdrmed integrally with the casin'g 5 and extending )ara lelwith the grinding wheel 2 is a brac et 7 which is provided with a bracket 7 is an adjustable bracket 9, which 'of a screw 17 bracket 7, and asiot 11 in the adjustable bracket 9. The outer end of this adjustable bracket 9 is rovided with longitudinal slot 12, for receiving a screw Extension 13 on the end of a su porting b r 15, which bar extends ,paralle with the axis of the grinding wheel, and on which \isadjustably secured a drill holder supportdfi by means The s port 16 provided with a work rest and, 2 orwardly arid downwardly extending a1 and conn ed to this aim is an upwardly and forwar y extending pivot pin 18. 19 desi es the tool holder, whiclfis provided w' "a-- .-,V s'haped' groove in its upper face for the reception of the drill to be ground, and is also provided with a stop 20 at its upper end for the point of the drill to be ground. *Slidably mounted within the groove of the drill holder is an angle block 21, which is arranged to form the back stop for the drill to be ground, and' 22 is -a cli which is provided with downwardly and inwardly extending arms which engage the outer Walls of the drill .holder 19. v r

23 is a set screw for retaining the V-block 20 and the clamp 21 in their adjusted position. The upper face of the angle block 21 isrecessed to receive a spring 24, which surrounds the screw 23 and engagesv the block and the clamp 22 lows :Vari0us parts are secured in the positions shown in the drawings, and the drill holder support is adjusted at the proper angle on the supporting post 15 and secured in position. The drill is then placed in the holder and the screw 23 is slackcned and the stop 21 is moved into position against the back of the drill. The wheel is then rotated and theholder is swung about the pin 18 -The operation of the device is as fol to grind one of the lips of the drill, and 1 after the first lip is ground the drill is rotated degrees in the holder and the other li .is ground. The spring 24 between the clip and the V-block 210i the clamp is ar ranged to hold these parts in engagementwith a drill holder when the screwis slackened, so that they will 'not move down along I the holder by the force of gravity. By ad:

justing the position of the tool holder on the supporting bar 15, the angle of the lip.

of the drill can bevaried.

The. advantages}, ,g ny nvcnt on result from the provision of an attachment for grmd n drills which can readil be seoured to end etache'd from the hind and grindm-achine. Further from the provision. of means for reteinin the back stop from movement along the rill holder when the set screw is slack-sued. v i

1-. A drill holding attachment for grinding machines comprising eh adjustable support, means for securing the support to a grinding machine, an adjustable stud extending arallel with the axis of the grinding whee ,means for securing said stud to the support, a Work rest adjustebly mounted on said stud means for securiu said work rest in its ad usted position, an a drill holder SlfiPOljtlH arm connected to the work rest;

stantia 1y as described 2. A drill holding attachment for grind ing machines, comprising an adjustable support, screws for securing the support in its adjusted position to the grinding machine, an adjustable stud connected to said support -g-rindin wheel, a screw device for securine the stud in its adjusted position, a dril. holder support adjusteblymounted on the stud, and a drill holderrotetebly mounted on the drill holder support; substantially as described. l

In testimony whereof I have hereunto set my hand.

Witnesses: G..H. GREENWOOD,

Gnome N. ALLEN.

and extending parallel with the axisof the x ASHMEAD nouleses. 

